Which event first takes place during DNA replication? A single-stranded DNA molecule serves as a template.

Free nucleotides are bonded together in the correct sequence.

Hydrogen bonds break and a double-stranded DNA molecule separates.

Hydrogen bonds break and a double-stranded RNA molecule separates.

25) a student takes four samples of a white crystalline solid and places each in a well plate. on top of each sample, she carefully places 20 drops of clear mystery liquids a, b, c and d. her results for each well are: liquid a: the solid dissolves quickly. liquid b: the solid appears unchanged. liquid c: a brownish colored liquid is produced. liquid d: fizzing occurs and the well becomes warmer. in which well does a physical change occur?

Me with these questions image attached

In which of the following relationships is one organism always benefited while the other organism is always harmed